Citation: QIN Zhan-Jie, ZHANG Xiang-Ru, PENG Zhang-Kuang, LI Qing-Kuan, MA Yun-Qi, FAN Qi-Shun, DU Yong-Sheng, WANG Jian-Ping, SHAN Fa-Shou. Extraction and Separation of Boron in Anhydrite and Gypsum Minerals and Its Isotopic Measurement by Thermal Ionization Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(1): 48-54. doi: 10.11895/j.issn.0253-3820.170331 shu

Extraction and Separation of Boron in Anhydrite and Gypsum Minerals and Its Isotopic Measurement by Thermal Ionization Mass Spectrometry

QIN Zhan-Jie ^1,2,3, ,
ZHANG Xiang-Ru ^1,2,3 ,
PENG Zhang-Kuang ^1,2 ,
LI Qing-Kuan ^1,2,3 ,
MA Yun-Qi ^1,2 ,
FAN Qi-Shun ^1,2 ,
DU Yong-Sheng ^1,2 ,
WANG Jian-Ping ^1,2 ,
SHAN Fa-Shou ^1,2

1.
Key Laboratory of Comprehensive and Highly efficient Utilization of Salt Lake Resources, Qinhai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China;2 Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Xining 810008, China;3 University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 26 May 2017
Revised Date: 18 September 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 41502096, 41473117), the CAS key Technology Talent Program (2015) and the Applied Basic Research Program of Qinghai Province, China (No. 2016-ZJ-715).

The anhydrite and gypsum are the main sulfate minerals during evaporation of seawater or lake. They record the information about relative hydrogeology and the composition of mother liquor. Boron is diffluent element, and often occurs in all kinds of evaporites. Presently, the boron isotope has been applied widely in mineral deposits forming, geochemistry and palaeoenvironment. However, there is little research about characteristic of boron isotope in anhydrite and gypsum minerals, because of the low content of boron and micro-solubility in water and hydrochloric acid. This study developed a method of extracting and purifying boron in anhydrite and gypsum by phase transformation and ion-exchange. Firstly, the samples were mixed with ammonium hydrogen carbonate to transform the calcium sulfate to calcium carbonate. And diluted hydrochloric acid (1 mol/L) was added to resolve calcium carbonate. The percent conversion was about 85% in the first stage, and up to complete resolution by repeating this process. Secondly, boron specific ion-exchange resin (Amberlite IRA 743) was used to gather the boron ions fully and further refined the samples with more than 1 μg of boron by anionic and cationic resin mixed by Ion Exchange Ⅱ and Dowex 50 W×8. Finally, according to the modified method by He, the values of boron isotope were determined by TIMS. The boron content is analytically pure gypsum was 3.501±0.128 μg/g (n=12, RSD=3.6%) and the average recovery was 100.47%. Besides, the δ11B value of analytically pure gypsum added with NIST SRM 951 was 17.98‰±0.21‰ (n=3, RSD=1.2%). This method has good repeatability and can meet the requirements of boron isotopic measurement of anhydrite and gypsum.
- Anhydrite and gypsum,
- Boron isotope,
- Phase transformation,
- Ion exchange method
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